Operation device of shift mechanism in manual transmission
a gearshift mechanism and manual transmission technology, applied in mechanical control devices, process and machine control, instruments, etc., can solve the problems of difficult to adjust the shift feeling of each inclined cam surface, and it is difficult to change the load characteristics of forward and backward, so as to reduce the number of components
Inactive Publication Date: 2012-08-02
AISIN AI CO LTD
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Benefits of technology
[0013]In a practical embodiment of the present invention, a plurality of leaf springs each formed with a V-shaped concave and fixed at their side portions to opposite ends of the cylindrical support member are symmetrically arranged in such a manner that the radial projection of the operation shaft is enclosed by the V-shaped concaves of the leaf springs. In such an embodiment, biasing forces of the leaf springs radially inwardly acting on the operation shaft are balanced without causing any arcuation of the operation shaft for smooth shift operation.
[0014]As in the operation device of the present invention, the operation shaft with the radial projection is axially displaceable and rotatable with respect to the leaf spring, the operation shaft can be utilized as a single shift-and-select shaft to provide a select mechanism united with a shift mechanism to reduce the number of component parts.
Problems solved by technology
It is, however, difficult to arcuate each inclined cam surface for adjustment of the shift feeling since the inclined cam surfaces 3b are short in length in comparison with the diameter of ball 8.
It is also difficult to effect load characteristics different in forward and backward shifting operations for adjustment of the shift feeling.
Method used
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[0027]The present invention is adapted to an operation shaft of a shift mechanism to be axially shifted as a fork shaft in a shift-and-select mechanism shown in FIG. 8 or 10. Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
[0028]As shown in FIGS. 1 and 2, an operation shaft 25 axially movable in a shift mechanism is formed thereon with a radial projection 26 having a spherical surface. A cylindrical support member 21 is fixedly mounted within a transmission housing and placed concentrically with the operation shaft 25. Four leaf springs 30 enclosing the radial projection 26 of operation shaft 25 are symmetrically arranged in engagement with the spherical surface of radial projection 26. The leaf springs 30 each are made of steel and have a central portion 31 formed with a V-shaped concave 31a to be engaged with the radial projection 26 of operation shaft 25 and a pair of parallel side portions 32 fixed to opposite ends of...
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An operation device of a shift mechanism in a manual transmission includes a cylindrical support member fixedly mounted within the transmission housing in such a manner that a radial projection on an operation shaft of the shift mechanism is concentrically placed in the cylindrical support member and a leaf spring having a central portion formed with a V-shaped concave to be engaged with the radial projection of the operation shaft and a pair of side portions fixed to opposite ends of the cylindrical support member such that the V-shaped concave is maintained in engagement with the radial projection to retain the operation shaft in a neutral position, whereby load of the leaf spring acting on the operation shaft respectively when shifted in one direction and in the other direction can be adjusted in different characteristics.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an operation device of a gearshift mechanism in a manual transmission and, more particularly to an operation device capable of adjusting load characteristics of operation stroke in a shift-and-select mechanism.[0003]2. Description of the Prior Art[0004]Disclosed in Japanese Patent Laid-open Publication No. 2004-100741 is a manual transmission which includes a plurality of change-speed gear pairs provided between an output shaft and a counter shaft mounted in parallel within a transmission housing and a shift-and-select mechanism for selectively operating a plurality of gear-shift mechanisms provided between the change-speed gear pairs, wherein the change-speed gear pairs are selectively engaged by operation of the shift-and-select mechanism to establish a drive power train.[0005]As shown in FIG. 8, the shift-and-select mechanism in the manual transmission includes three fork shafts 4 mou...
Claims
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CPCF16H63/38F16H2059/0295
Inventor MIZUTANI, ISAOHIMENO, ARISA
Owner AISIN AI CO LTD